/*

    File: ServerController.m

Abstract: 

This class implements the controller object for the server application. It is 

responsible for setting up public Mach port for the server and listening for

client applications to start up.  It also sends frame display update requests

to all clients after every frame update.

It is also responsible for creating the initial set of IOSurfaces used to send

rendered frames to the client applications.

 Version: 1.2

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without specific prior written permission from Apple.  Except as

expressly stated in this notice, no other rights or licenses, express or

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works in which the Apple Software may be incorporated.

The Apple Software is provided by Apple on an "AS IS" basis.  APPLE

MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION

THE IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS

FOR A PARTICULAR PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND

OPERATION ALONE OR IN COMBINATION WITH YOUR PRODUCTS.

IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL

OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

INTERRUPTION) ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION,

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Copyright (C) 2014 Apple Inc. All Rights Reserved.

*/

#import "ServerController.h"

#import "MultiGPUMig.h"

#import "MultiGPUMigServer.h"

#import "ServerOpenGLView.h"

@interface ServerController()

{

    IBOutlet NSWindow *_window;

    IBOutlet ServerOpenGLView *_view;

    IBOutlet NSPopUpButton *_rendererPopup;

    NSTimer *_timer;

    NSMachPort *serverPort;

    NSMachPort *localPort;

    uint32_t serverPortName;

    uint32_t localPortName;

    NSMachPort *clientPort[16];

    uint32_t clientPortNames[16];

    uint32_t clientPortCount;

    int32_t clientIndex;

    uint32_t nextFrameIndex;

    IOSurfaceRef _ioSurfaceBuffers[NUM_IOSURFACE_BUFFERS];

    GLuint _textureNames[NUM_IOSURFACE_BUFFERS];

    GLuint _fboNames[NUM_IOSURFACE_BUFFERS];

    uint32_t rendererIndex;

}

@end

@implementation ServerController

- (void)applicationWillFinishLaunching:(NSNotification *)note

{

    [[NSNotificationCenter defaultCenter] addObserver:self 

        selector:@selector(portDied:) name:NSPortDidBecomeInvalidNotification object:nil];

    [_rendererPopup removeAllItems];

    [_rendererPopup addItemsWithTitles:[_view rendererNames]];

    [_view setRendererIndex:0];

    [_rendererPopup selectItemAtIndex:0];

    serverPort = [(NSMachPort *)([[NSMachBootstrapServer sharedInstance] servicePortWithName:@"com.apple.MultiGPUServer"]) retain];

    // Create a local dummy reply port to use with the mig reply stuff

    localPort = [[NSMachPort alloc] init];

    // Retrieve raw mach port names.

    serverPortName = [serverPort machPort];

    localPortName  = [localPort machPort];

    [serverPort setDelegate:self];

    [serverPort scheduleInRunLoop:[NSRunLoop currentRunLoop] forMode:NSRunLoopCommonModes];

    // Set up all of our iosurface buffers      

    int i;

    for(i = 0; i < NUM_IOSURFACE_BUFFERS; i++)

         _ioSurfaceBuffers[i] = IOSurfaceCreate((CFDictionaryRef)@{(id)kIOSurfaceWidth: @512,

            (id)kIOSurfaceHeight: @512,

            (id)kIOSurfaceBytesPerElement: @4,

            (id)kIOSurfaceIsGlobal: @YES});     

}

- (void)applicationDidFinishLaunching:(NSNotification *)note

{

    // Fire up animation timer.

    _timer = [[NSTimer timerWithTimeInterval:1.0f/60.0f target:self selector:@selector(animate:) userInfo:nil repeats:YES] retain];

    [[NSRunLoop currentRunLoop] addTimer:_timer forMode:NSRunLoopCommonModes];

}

- (void)portDied:(NSNotification *)notification

{

    NSPort *port = [notification object];

    if(port == serverPort)

    {

        [NSApp terminate:self];

    }

    else

    {       

        int i;

        for(i = 0; i < clientPortCount+1; i++)

        {

            if([clientPort[i] isEqual:port])

            {

                [clientPort[i] release];

                clientPort[i] = nil;

                clientPortNames[i] = 0;

            }

        }

    }

}

- (void)handleMachMessage:(void *)msg

{

    union __ReplyUnion___MGCMGSServer_subsystem reply;

    mach_msg_header_t *reply_header = (void *)&reply;

    kern_return_t kr;

    if(MGSServer_server(msg, reply_header) && reply_header->msgh_remote_port != MACH_PORT_NULL)

    {

        kr = mach_msg(reply_header, MACH_SEND_MSG, reply_header->msgh_size, 0, MACH_PORT_NULL, 

                 0, MACH_PORT_NULL);

        if(kr != 0)

            [NSApp terminate:nil];

    }

}

- (kern_return_t)checkInClient:(mach_port_t)client_port index:(int32_t *)client_index

{   

    clientPortCount++;          // clients always start at index 1

    clientPortNames[clientPortCount] = client_port;

    clientPort[clientPortCount] = [[NSMachPort alloc] initWithMachPort:client_port];

    *client_index = clientPortCount;

    return 0;

}

kern_return_t _MGSCheckinClient(mach_port_t server_port, mach_port_t client_port,

                   int32_t *client_index)

{

    return [(ServerController *)[NSApp delegate] checkInClient:client_port index:client_index];

}

// For the server, this is a no-op

kern_return_t _MGSDisplayFrame(mach_port_t server_port, int32_t frame_index, uint32_t iosurface_id)

{

    return 0;

}

- (GLuint)currentTextureName

{

    return _textureNames[nextFrameIndex];

}

- (GLuint)currentFBOName

{

    return _fboNames[nextFrameIndex];

}

- (void)animate:(NSTimer *)timer

{

    if(!_textureNames[nextFrameIndex])

    {

        _textureNames[nextFrameIndex] = [_view setupIOSurfaceTexture:_ioSurfaceBuffers[nextFrameIndex] fboName:&_fboNames[nextFrameIndex]];

    }

    [_view setNeedsDisplay:YES];

    [_view display];

    int i;

    for(i = 0; i < clientPortCount+1; i++)

    {

        if(clientPortNames[i])

        {

            _MGCDisplayFrame(clientPortNames[i], 

                     nextFrameIndex, 

                     IOSurfaceGetID(_ioSurfaceBuffers[nextFrameIndex]));

        }

    }

    nextFrameIndex = (nextFrameIndex + 1) % NUM_IOSURFACE_BUFFERS;

}

- (IBAction)setRenderer:(id)sender

{

    [_view setRendererIndex:(rendererIndex = [sender indexOfSelectedItem])];

}

@end